Being a Lyctor isn't at all what Harrow expected and Ascension has brought her nothing but grief. The Emperor immediately arranges for some of the resurrected, who have been in stasis for ten thousand years, to be transported to the Ninth, her former House. However, as a Lyctor Harrow has little time to brood over their fate because she must begin preparing to join the other Lyctors in battle against the great Resurrection Beasts. Each beast started as the soul of a planet that was altered by that planet's Resurrection and now Harrow and Ianthe, the other new Lyctor, have only a year to become fully functional or they will likely die when the next Beast is engaged. Of course, that is assuming the other Lyctors don't kill Harrow first.
Because the marketing hype for Gideon appeals more to millennials it led me to avoid this book until I was desperate for something new. The publisher's blurb also gives the impression of yet another teen competition plot albeit with lesbian necromancers and dirty magazines this time. The first chapter does in fact mention dirty magazines, and there are in fact necromancers, but ignore the rest as the Post-Resurrection Empire is a unique and strange setting. The Undying Emperor, father of the resurrection, has spent the last ten thousand years fighting a terrible cosmic threat with the aid of his immortal Lyctors. For the first time he has issued an invitation to the eight noble houses to send their best necromancer, along with their cavalier, to attempt Ascension and become Lyctors to replace the fallen. The brilliant and psychotic necromancer Harrowhark sees this as an opportunity to save the dying Ninth House if she Ascends but first she needs a cavalier. Gideon only cares because the announcement interrupts her latest and best attempt to escape the Ninth and join the army but then Harrowhark offers her an irresistible deal. Help Harrow Ascend and she will not only sign the paperwork so she can legally join the army, but also have Gideon commissioned as an officer.
The war has spread and it now consumes the entire solar system. Blood and violence are pervasive as the fledgling Republic tries to hang against those who oppose it. Many want to return to the old color based society while others view this conflict as an opportunity to rise to power, so there is no shortage of combatants available. Like the last book, Iron Gold, this story is told from the perspectives of the same PoV characters (plus Mustang this time) and each of them experiences this conflict from a different location within the solar system. With such a complicated set of battles it will take you some time to get your bearings, especially if it has been a while since you read the last book, but once you get everything sorted out this is another wild ride in a series that remains surprisingly compelling.